COMBINING STRUCTURE BETWEEN SEAT BODY AND SEAT CHASSIS OF CHAIR

Abstract

A seat body is assembled with a seat chassis device that has a seat chassis mounted on the seat body. The seat body has an accommodating space and guiding troughs each having a guiding opening. The accommodating space includes a propping portion to be resiliently flattened. The seat chassis device has a base connected thereto and is formed with sliding wedge portions to slide into the guiding troughs from the guiding openings. When the seat chassis slides to a predetermined position, the propping portion springs up and abuts against the seat chassis. A spring between the base and the seat chassis is upward pushed by a resilience-adjusting unit and has its upper end received in a dome raised from the seat chassis and received in a hollow portion of the seat body.

Claims

1. A combining structure comprising a seat body and a seat chassis of a chair, wherein the seat body has a bottom assembled with a seat chassis device that is connected to a chair leg assembly, wherein the seat chassis device has a top surface provided with the seat chassis that is mounted on the seat body, with: the seat body having a bottom depressedly formed with an accommodating space, the accommodating space having two opposite laterals formed with front and back L-shaped guiding troughs each having a guiding opening, and the accommodating space having a bottom provided with a propping portion that is raised from the bottom and is configured to be resiliently flattened; the seat chassis device having a base pivotally connected thereto from below for connecting the chair leg assembly, the seat chassis having two opposite laterals formed with front and back sliding wedge portions configured to slide into the front and back L-shaped guiding troughs from the guiding openings, wherein when the seat chassis slides to a predetermined position, the propping portion provided in the accommodating space of the seat body springs up and abuts against a front end of the seat chassis; and a spring being loaded between a back end of the base and the seat chassis with a lower end settled on the base through a resilience-adjusting unit that upward pushes the spring, the spring having a upper end received in a dome raised from the seat chassis, and the seat body having a hollow portion positionally corresponding to and for receiving the dome.

2. The combining structure of claim 1, wherein the seat chassis has a top surface provided with continuous positioning teeth, wherein the seat body is provided with an extendable positioning claw positionally corresponding to the continuous positioning teeth, and wherein when the seat body slides to the predetermined position along the front and back L-shaped guiding troughs, the extendable positioning claw engages with corresponding positioning teeth of the continuous positioning teeth, allowing the seat body to be adjusted in a forward-and backward direction.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0010] FIG. 1 is a top exploded view of a seat body and a seat chassis device according to the present invention.

[0011] FIG. 2 is a bottom exploded view of the seat body and the seat chassis device according to the present invention.

[0012] FIG. 3 is a front schematic view of the present invention showing the seat body's bottom positioning device.

[0013] FIG. 4 is an exploded view of the present invention showing the seat chassis device and the seat body.

[0014] FIG. 5 is a lateral schematic view of the present invention illustrating how the seat chassis device is assembled with the seat body.

[0015] FIG. 6 is a lateral schematic view of the present invention showing the seat chassis device assembled with the seat body.

[0016] FIG. 7 is a schematic view illustrating sliding adjustment and positioning of the seat body according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

[0017] Referring to FIG. 1 and FIG. 2, according to the present invention, a seat body 1 for carrying a cushion has its bottom mounted on a seat chassis device 2 that is further combined with a chair leg assembly. The seat chassis device 2 primarily comprises a top surface provided with a seat chassis 21. A base 22 is pivotally connected to the seat chassis 21 from below. The seat chassis 21 has its two laterals each formed with a front and a back sliding wedge portion 211. The seat chassis 21 has its top surface provided with continuous positioning teeth 212 at its center near its front end, and formed with a raised portion near its back end, wherein the raised portion defines a dome 213 therein.

[0018] In addition, the foregoing seat body 1 has its bottom depressedly formed with an accommodating space 10 for receiving the seat chassis device 2. The accommodating space 10 has its two opposite laterals each formed with a front and a back L-shaped guiding trough 11. Each of the guiding trough 11 has its one end formed with a guiding opening 110. The accommodating space 10 has its bottom provided with a propping portion 12 at its center near its front edge. The propping portion 12 is raised from the bottom and is configured to be resiliently flattened. Also referring to FIG. 3, the accommodating space 10 further has its bottom depressedly formed with a sliding track 13 that has a fixed cover. The sliding track 13 has a receiving recess 14 for receiving a spring 16. A positioning claw 15 is slidably installed in the sliding track 13, so that the positioning claw 15 is perfectly aligned with the continuous positioning teeth 212 on the seat chassis 21. The spring 16 has its back end abutting against the receiving recess 14, and has its front end abutting against the positioning claw 15. Thereby, the positioning claw 15 can slide along the sliding track 13 on response to a pulling force from a user-operated control cord, in turn achieving control of engagement and disengagement between the positioning claw 15 and the positioning teeth 212.

[0019] Referring also to FIG. 4, a resilience-adjusting unit 3 may be installed between the seat chassis 21 and the base 22 of the seat chassis device 2 for adjusting resilient support from the chair's backrest. The resilience-adjusting unit 3 comprises a spring 31 settled on the base 22 with the upper end of the spring 31 received in the dome 213 at the back end of the seat chassis 31. The seat body 1 has a hollow portion 17 positionally corresponding to the dome 213, so that the dome 213 raised from the adjacent seat chassis 21 is movably received in the hollow portion 17.

[0020] Thus, as shown in FIGS. 5 and 6, the seat chassis device 2 is installed into the accommodating space 10 from the lower part of the seat body 1. Then the sliding wedge portions 211 at front and back parts of the seat chassis 21 slide into the guiding troughs 11 through the guiding openings 110. Afterward, the seat chassis device 2 slides backward along the front and back guiding troughs 11. After the propping portion 12 is pressed and flattened by the seat chassis 21 and then resiliently returns to its normal position, the seat chassis device 2 (i.e. the seat chassis 21) is retained at its front end by the propping portion 12 and is prevented from slipping away from the guiding opening 110 of the guiding trough 11, while the seat chassis device 2 is allowed to slide in the guiding trough 11, which means the seat body 1 is allowed to slide to and fro.

[0021] Meanwhile, the extendable positioning claw 15 installed in the accommodating space 10 of the seat body 1 can correspondingly engage with and disengage from the continuous positioning teeth 212 on the seat chassis 21 of the seat chassis device 2.

[0022] Thus, the sliding wedge portions 211 at the two sides of the seat chassis 21 of the seat chassis device 2 can easily slide into the guiding troughs 11 at the right and left laterals of the accommodating space 10 depressedly formed on the bottom of the seat body 1 for convenient assembling operation. Moreover, the combination between the positioning claw 15 installed in the accommodating space 10 and the continuous positioning teeth 212 correspondingly provided on the seat chassis 21 allows the seat body 1 to be adjusted to and fro in a sliding manner without using any additional slide-guiding components. Furthermore, the hollow portion 17 at the back end of the seat body 1 receives the raised dome 213 of the seat chassis 21 of the seat chassis device 2, so the spring 31 of the resilience-adjusting unit 3 can stand upright in the seat chassis device 2. With these configurations, only single said spring 31 is sufficient to provide a proper resilient force, so the resilience-adjusting unit 3 can structurally keep simple.